未应用嵌套自定义小部件的样式表 [英] Stylesheet for nested custom widget not applied

问题描述

我希望以下代码在外部主窗口内显示一个小的黑色区域:

I expect the following code to show a small black area inside outer main window:

class Canvas(QWidget):
    pass

app = QApplication(sys.argv)
outer = QWidget()
w = Canvas(outer)
w.setStyleSheet("background-color: black")
outer.show()

但是看起来样式表没有被应用:整个外部窗口都是灰色的.但是，如果 w 是 QWidget，代码会按预期工作.当 Canvas 实例直接显示(没有父级)时，样式表也被正确应用:

But looks like the stylesheet is not applied: entire outer window is gray. However, if w is a QWidget, code works as expected. When Canvas instance is shown directly (without parent) stylesheet is properly applied as well:

w = Canvas()
w.setStyleSheet("background-color: black")
w.show()

此代码显示一个黑色窗口.我在 C++ 中使用 Qt 4.8.6 进行了相同的尝试，样式表也正确应用于从 QWidget 派生的嵌套小部件.

This code shows a black window. I have tried same in C++ with Qt 4.8.6 and stylesheet is also properly applied for nested widgets derived from QWidget.

我错过了什么?我在 Ubuntu 14.04 下使用 python 2.7.6、Qt 4.8.6 和 PyQt 4.10.4.

What am I missing? I am using python 2.7.6, Qt 4.8.6 and PyQt 4.10.4 under Ubuntu 14.04.

推荐答案

QWidget 子类默认会忽略样式表(出于性能原因).

A QWidget subclass will ignore stylesheets by default (for performance reasons).

试试这个:

w = Canvas(outer)
w.setAttribute(QtCore.Qt.WA_StyledBackground)
w.setStyleSheet("background-color: black")

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